Treatment.

Valerian shook his head as he heard this question coming from the princess and said, "You are thinking too much, did you not see how they treat me? How can I be slaving off?" 

Morgana shook her head and said, "This does not prove anything, they could be putting up a front. How can you know what is hiding in the heart of a monarch?"

Valerian shook his head and said, "I cannot prove it to you without revealing a few secrets that are not convenient to talk about at this moment. So, just trust me and you will know in the future." 

The princess stared at his back as the beast moved through the skies. They both of them did not talk they were aware that neither of them was wrong and that they will only be dragging this argument by discussing something like trust. The intellect of the two children was not shallow.